DROUGHT-HARDENING IMPROVES FLOODING TOLERANCE OF MAIZE AT SEEDLING STAGE UNDER DROUGHT-FLOOD ABRUPT ALTERNATIONS
文献类型： 外文期刊
第一作者： Li, C. X.
作者： Li, C. X.;Hamani, A. K. M.;Sun, J. S.;Wang, G. S.;Ning, H. F.;Liu, Z. D.;Han, Q. S.;Li, C. X.;Sun, J. S.;Wang, G. S.;Ning, H. F.;Liu, Z. D.;Han, Q. S.
作者机构：
关键词： leaf area; biomass; ABA concentration; stomatal conductance e; transpiration
期刊名称：APPLIED ECOLOGY AND ENVIRONMENTAL RESEARCH （ 影响因子：0.816； 五年影响因子：0.896 ）
ISSN： 1589-1623
年卷期：
页码：
收录情况： SCI
摘要： In recent years, the frequency and intensity of drought???flood abrupt alterations due to global climate change have drastically increased. In contrast, plant response to the drought-flood abrupt alternations remains unclear. In the current study to reveal maize???s physiological response to drought-flood abrupt alternations, these were carried out in two stages in this study, i.e., three levels of water deficit (WD, i.e., 75%, 65%, and 55% of the field capacity) in stage I, and then five durations of flooding (75%-WDi, 65%-WDi and 55%-WDi) in stage II. The results indicated that the 65%-WDi treatment significantly decreased the leaf area and biomass of maize seedlings in stage I, while maintaining plant growth and reaching the control level in stage II. Abscisic acid (ABA) concentration in maize leaves and roots of 0-5 cm depth was sensitive to drought stress. Under drought???flood abrupt alternations, the root system in 55%WD5 and 65%-WD7 exhibited strong ABA signal, which was sensitive to drought-flood abrupt alternations. Therefore, at the maize seedling stage, proper control of soil moisture is beneficial for improving stress tolerance at later stages, but stress tolerance after drought???flood abrupt alterations is related to the degree of drought exposure at the early stage.
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